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#!/bin/bashBACKFILE=${1}.bkpif [ -e $1 ]; thenif [ -e $BACKFILE ]; then        echo "Overwrite ${BACKFILE}\? y/n"        read        if [ $REPLY == "y" ]; then                bak()        else                break        fielse        bak()fifivim $1function bak { mv $1 $BACKFILE; }